Development of the electric furnace for the growth of relaxor type ferroelectrics single crystal and development of the crystal growth technique.

弛豫型铁电体单晶生长用电炉的开发及晶体生长技术的开发。

• 批准号: 11650705
• 负责人: FUJITA Kazuhiro
• 金额: $ 1.73万
• 依托单位: Gifu National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650705/
• 关键词: relaxor; ferroelectrics; crystal growth; flux method; electric furnace; dielectric constant; 温度制御; 熔融法; 結晶育成; 強度制御; 溶融法

Electric furnace for the crystal growth, which make an aim to large and high quality ferroelectrics single crystals, are designed and produced. The specification for electric furnace are as follows. Ordinary temperature : 1500℃, maximum temperature : 1550℃, soaking space in electric furnace, 150 X 150 X 150H mm (the crucihle installation position), temperature control is excused by PID program controller, which can communicate the personal computer using RS-232Cinterface, that records the furnace temperature automatically. In the case of abnormal occurrence, electric furnace breaks a circuit automatically to stop power supply.Recently much attention has been given to relaxor type ferroelectrics from view point of fundamental interest and practical development of some electronic devices. In this work, Relaxor type ferroelectrics (1-x)Pb(Zn_<1/3>Nb_<2/3>)0_3-xPbTi0_3 and (1-x)Pb(Mn_<1/3>Nb_<2/3>)O_3-xPbTi0_3 were grown by using of PbO flux solution method. Processing conditions were investigated to increase the size and yield of the perovskite crystals, including variation of the flux to composition ratio, cooling rate, soak time and soak temperature. The crystals varied in size from 1 mm to 3.5 mm on an edge, and in color from opaque to brown due to the changes in some processing conditions. The furnace temperature reached 1180ーC, soaking time is from 5 to 10 hours, cooling rate is -2℃ per hour from 1180℃ to 850℃. These conditions are suitable for crystal growth. The crystals were characterized by X-ray diffraction, dielectric constant and dielectric loss measurements.

设计并生产了以大尺寸、高质量铁电单晶为目标的晶体生长电炉。电炉规格如下。常温：1500℃，最高温度：1550℃，电炉内均热空间，150×150×150H mm(十字架安装位置)，无需进行温度控制，可通过RS-232接口与PC机通讯，自动记录炉温。在异常情况下，电炉会自动切断电路以停止供电。近年来，从一些电子器件的基本利益和实际发展的角度出发，弛豫型铁电材料受到了极大的关注。本文采用PbO助熔剂溶液法生长了弛豫型铁电材料(1-x)Pb(Zn_&lt；1/3&gt；Nb_&lt；2/3&gt；)0_3-xPbTi0_3和(1-x)Pb(Mn_&lt；1/3&gt；Nb_&lt；2/3&gt；)O_3-xPbTi0_3。研究了提高钙钛矿晶体尺寸和产率的工艺条件，包括改变助熔剂与组成比、冷却速度、浸泡时间和浸泡温度。由于某些工艺条件的改变，晶体的边缘尺寸从1 mm到3.5 mm不等，颜色从不透明到棕色。炉温达到1180ーC，保温时间为5~10小时，冷却速度为-2℃/h，从1180℃到850℃。这些条件都适合晶体生长。用X射线衍射仪、介电常数和介电损耗测量对晶体进行了表征。